Heat-radiating device.



hrm-881,141

- PTENTED MAR. 10,' .19% J. L. PERKINS.

HEAT RADIATING DEVIGE.

APPLIOTIOH FILED 5111136.190?.

No. 881,147. PATENTED MAR. 10, 190.8.

* J. L. PERKINS.` y VHEAT RADIATING DEVICE.

APPLIO T 0N FILED J "IE 5.1 07.

A I Ul. 9 2SEEETS-SIEEET 2 )'will deflect the air striking thereagainst'in an upwardly spiral course opposite to the airA ,currents set up on the opposite side of the cylinder. ed by centrifugal action as their eneraldirection lis away from-the centersw crees the air currentson the side c, beingtopploed by the centrifugal force referred t0 are arl'ested in their movement downwardlyyand around the cylinder and are eventually turned back by the centrifugal action to which they are I subiected; and because, as they sweep arcuri/d baci of the cylinder, they are drawn in behind 4i't/by the greater or less rarefaction'of the air ,at that oint andere then thrown radially outwarcl' thus completely covering the entire surface 'of the cylinden. The currents'from the side c, as they'sweep downwardly around the cylinder are also met by the upwardly trending currents from the side dwhichare; drawn more or lessl around behind'the cylinderby vreason of the slight rarefaction of the air-at that point above referred to.

On the upper end of the cylinder, ya' casing f eis cast extending/over the exhaust-valve port f, the opening through this casing being so disposed that t e air will have a free assage therethrough as the cylindcrsrevo ve, and on each side. of s'aid casing are cast the deiecting ribs g whose sides are substantially parallel with theaxis ',of the cylinder, the

"able to ders a .general direction of whicl1,'as shown in the 'plan view, follow the outline of4 the casing' which is 'somewhatnerrowed down midway between ite ends; these ribs g therefore tend to direct the air currents against the Wall of the casing e, and, with the passage of air through said casin ,fthe exhaust valveV and` its seat 4areeilicient y cooled.

In engines of relatively large sizewhichf are to run at high rates ofspeed, it iss-desir# air, these wings faciii'gpof-coursc, in the di-l rection of the rotation of the enguie.

By narrowing theupper end of the plate, as at lc," the volume of air taken in atthe The currents on the side d are Aaid- '--posed therearound "facing in the plane o ipply to the back side of the .eylinder, and heat-radiatin ellecting plate fh of sheet. metaLr sides is forced tln'ough'the' relatively restricted openings between the u per en dspof the spiral ribs and thus directe against the hottest part ofthe cylinder. It will be observed that the'deflecting plate does not eX- tend yabove the upper ends of the spiral ribs and therefore does not in any Way interfere with the circulation oillair through the'exl haunt-@valve casing or fever thev top of the i. ne combination wif-.hule andere of a,

revolving engine, of heat-radiating ribd-'s vi- 4 rally 'disposed around the cylinder WhereA y air isdirected around the latter -tothe.rear

side thereof, when -the engine is mnning.

2: The combination with the :cylinder of a 'revolving engine, of heat-radiating ribs S il rally disposed around` the outer end of t e;

cylinder, whereby air is directed Iarfou-nd .the

latter to `the rear side thereof Vwhen' theI enplate surroundln t der, and havin orwardly facing wm s 'ex-v tendin beyon the ed'ges of the ribs, at thek sides o the cylinder.

3.. A cylinder of a revolving engine provided with an exhaust valve in the' outer endv thereof, heat-radiatin posed therearound w ing devices' on theouter end of the cylinder to direct air over the erhaust val"A e.

4. Jl cylmderof a reyolvirig engine lprovided with an .exhaust valve in the outer end j devices spirally dis4` reby y air 1sdirected around. the. cylinder-to the rea-r side-thereofA when the engine is running, and heatfradiatgine is running, to etherwith a defleetiiigA y e rear side ofthe cylinefv thereoi,Y heat-radiatinedevices spirally :diss w reby air 1s Adirected around the cylinder 'to-the rear side thereof exhaust ya v'e havin anl opening therein rotation of the cylin-l vdevices to direct air against the sid'es'of'sai casing.

5. A cylinder of a revolving engine pro- .vded with an exhaust valve in the outer end thereof, heat .radiating devices: spirally -disy posed therearound vwhereby a1r lsdireted when the en ine yis ruiming, a casing over the .ich

around the cylinderto the rear-side thereofwhen the engine is.running,'. a` casing overthe exhaust-valve having openings at either end thereof facingin the cylinder, whereby -w across the exhaust valve. JULIANQL. PERKINS.

llifitnessesz. Y

WM. H. Charm, LK. l. CLEMoNs.

nga

plane 'of'rotation of the I en the engine is r u. ning an' will pass through'said casing and. 

